/*
 * Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com
 *
 * This software is provided 'as-is', without any express or implied
 * warranty.  In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 */

package org.box2dflash.common.math {
	import org.box2dflash.common.math.Mat22;

	/// A transform contains translation and rotation. It is used to represent
	/// the position and orientation of rigid frames.
	
	public class XForm {
		/// The default constructor does nothing (for performance).
		public function XForm(pos:Vec2 = null, r:Mat22 = null):void {
			if (pos) {
				position.v(pos);
				R.m(r);
			}
		}

		/// Initialize using a position vector and a rotation matrix.
		public function initialize(pos:Vec2, r:Mat22):void {
			position.v(pos);
			R.m(r);
		}

		/// Set this to the identity transform.
		public function identity():void {
			position.zero();
			R.identity();
		}

		public function set xForm (x:XForm):void {

			position.v(x.position);

			R.m(x.R);
		}

		public var position:Vec2 = new Vec2;
		public var R:Mat22 = new Mat22();
	}
}